Answer: signal

AnswerCrossword Clue
SIGNALUse a heliograph
SIGNALTraffic light, e.g.
SIGNALWink, e.g.
SIGNALPrepare to turn
SIGNALWave, e.g.
SIGNALPair of lamps, maybe
SIGNALNod, at auctions
SIGNALFlag, maybe
SIGNALA wink or a nod, say
SIGNALOne if by land, or two if by sea
SIGNALUse semaphore
SIGNALRadio transmission
SIGNALHigh-low play at bridge
SIGNALArmy's ... Corps
SIGNALDistinctive
SIGNALHigh-low play in bridge
SIGNALOutstanding
SIGNALWink or whistle, sometimes
signaldetectable physical quantity or impulse (as a voltage, current, or magnetic field strength) by which messages or information can be transmitted
signalsign indication
signalto notify by means of communication
signalobject used to transmit or convey information beyond the range of human voice
signalact, event, or watchword that has been agreed on as the occasion of concerted action
SIGNALIndicator
SIGNALBe a flag waver?
SIGNALIndicate silently
SIGNALBridge high-low play
SIGNALRemarkable
SIGNALTurn indicator
SIGNALBe a polite driver, in a way
SIGNALA wink or a nod, e.g.
SIGNALA wink or a nod, perhaps
SIGNALWhat bad drivers don't do
SIGNALIt hangs out on a street near you
SIGNALIndicate a turn
SIGNALTraffic light, for example
SIGNALFlare, usually
SIGNALUse a semaphore
SIGNALHerald
SIGNALUse a blinker